but they really haven't been to the intensive care units of the city hospitals, of people who are still dying of the disease. they haven't been in the doctor's offices of the people who are suffering from resistant strains who are now starting to see the end. and they certainly haven't been to the developing countries where the virus is running rampant. in africa, aids is already having an enormous impact. as i said earlier, it's already surpassed malaria as the number one killer. in addition to that it's killing young people, often uryoung pele in wm the county hainvest lot, in terms of education. and so in that respect, it's been very costly. it's also costly socially in ter of leing-- leaving a large number of children without both parents. and all indications are that its impact is going to get worse, maybe a lot worse. it's likely also that it's going to get much worse that it already is in some parts of asia. other sexually transmitted diseases may have taken a backseat to headlines about hiv, but they still take their toll. david bennett: we estimate, you know, 250 million, 300 m